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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5058fc74a44046f98355d0636edc6fdb96fdda754fd95450e4294a7ea79283cb' 
  AND token = 'bbUMgKYz4/c5Bt6QZbuyZGe5kXDuCejv6FBj1zbjSSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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