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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772e3e0526f2f373f766efda98f89e68ff6e7f605bf3e6b1b467d449d9334110' 
  AND token = 'K1cLNfzkU/fInZoBEwxm+IlwJ9lWlMESmd/hMCWZGbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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