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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272bc84b1447afa5f0d2708f921ee552257e23284835145c1e3fa7af906cdaad' 
  AND token = '1GDH4yJa8a+FQNT/AGS0Qbmd08qa+0tI4YtweuEua0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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