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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec5ce2fae813d8259771e14397e6ce4c2eb2cdb6c48e2fc87f1cafcdb456b61' 
  AND token = 'wvzJtCAMklIqr3eyQ5fqTLuxhiBwK4jzSppVpx3wp0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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