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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f504dde1b918c2133862a0dab219a6ec3e34d672d144b41fa908de89e8b895d6' 
  AND token = 'lhirG4/NaHcUvu8H2p+d29ULaABVMoedjRdVZ9GKqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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