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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aacfa16b0a920798d2a28da5c0052dd04ae47b4670959b38cb0396e2be3cba9' 
  AND token = 'KHld00d12srQOjspK7iSNvOGEuVLQbTRcr9c0+QE9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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