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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a6ef0f1ff47843a64cf7f29c293daf88b69f33024cc41f70f696b5468373d2' 
  AND token = 'dNF4fEef02qzN6dO1Bl0EhxttvjNmXOMAtVMJhTveLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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