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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3e0240d4d89cea51bc59cc3243947799a09b748455cb762cdbfee317e6d419' 
  AND token = 'jbCPLxb0WieDCZKgvNPW9qI4kX3bUjZucLm1SW+z35A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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