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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb63cda3eaf7049c382e4191743c09555c20b3edad186260ae2e28f0efa3a83' 
  AND token = 'HGW+9i3WCDI3TlyhN1H525Y8LerMVGQjnk6QMjt6Rd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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