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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad4441acdf04c8a8b34128122315ad751607faf33b07bbeea690d3c7c05d400' 
  AND token = '+oG1166qqS8hpYwjL1Taa+ZmoV1ynlwA4q5HQUosPT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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