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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb534779570a4c71483282c2d983589201854aad71f2bd514825574a02be83bd' 
  AND token = 'WLJ9VWEqnn3xK2u1nKUQh2Tyh9CGE+W8BH0i9mXRXtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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