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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d374f0c572d4d19538a0368b8877b9a50fb6c8d8320c95ee0ff7c172fa18524' 
  AND token = 'CDpFcAj3mxn+IuBxbRRju2Vnph7AATrkHQpYXmjbsY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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