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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953691d02f77ae19cf4089668c39029621c037e6213fb0c443942bec0caf3bea' 
  AND token = 'ZC9S1Qdocc4fv+n0Ozpqec9c6Cnrf86p0+ljlW+Js4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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