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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1a5918ff4c7c4e8436e7337fba9408e73ec254f391125191936093e7a7db88' 
  AND token = 'qEYyma6u224hcj24XMyzPJKzpgs5T8Kl9hyIhmem4+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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