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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa36237addc037bb09a2a4bc120dd0d446ab450dbf583ce8c582aad275931fa' 
  AND token = '8l0ZJqe/Bps9BU9s1n8JQvYq/JKNI8Eu5U+IMnYZPMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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