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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412154d105fcc708d31e03389a27ec385ba1a4a4745b1d66ab4b15cdea17d437' 
  AND token = 'mZ0+XcH7+6G4G28F6LC+epaXkSIspx8+IpIq022bLfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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