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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d1f76d1acafbc1ee4d0d8befd6a7c2cd1c7e59af2ba0da006c34309d10d48d' 
  AND token = 'ifqs2E/wg3Zt1HH5Vx2jj12v6SwFUKO+TWGodSb9s2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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