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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea2b7f0e2d11daa373983f77b50dbed0c1102ba9b9c0a28489166060d155a31' 
  AND token = 'gl4UacuNP4b3Vya3RJoXtpXWVvjUPHl+g+c8YWtQy+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}