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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d14014472376463379706750cbb2f38fa59a4c9c20d47f2498b5ca184e801d' 
  AND token = 'ugrxy5yWKu5pNpr30oL5+8genT70alSWaHaYjtzzNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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