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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1afe4a9c51a3e842ed986868236aa3f3a183e11eb3d084f6f7f65caac662bf' 
  AND token = 'Its39vmu+QMtCXB2ey6NMFc6I3OkPYgxlYJv2eX2RUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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