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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebd0036a10c036869b6cb499d442a0d32fe52d825d07d065d2f0282e76ad06f' 
  AND token = '+qtq1KRQHPgHS2QErk3Jq/sf+tD6X84k2k7E9tt3Its=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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