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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765ce277981525279dab37e3ef8506b8c6af936fd5695938a45e4fcfffe93134' 
  AND token = 'Gfe0nQ9QPF71luOoPO+oPuoVvivh5Db70VpV8i2esTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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