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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97440d8ca61a9ad4f7ea94e272fa02c6e7ce1c166f464a04806e427b5afa6fbc' 
  AND token = 'cSquMMlyBPaG4HfZNCxAkXPWTdpiDNdGKl7pUYsdx54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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