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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23631291941f65a43535646c2f4c578cf62948c59fd5d07b7072a4a8b8bb288d' 
  AND token = 'SEtpSc7vKWe2PhUdKSm1CwfGJkk5mbYOeyG4Y7kiqmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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