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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c93f40fbb1d8bd4ab6acbbccc1a004b8e66f92d08f9cea7d67d1f0183b61af' 
  AND token = 'YfsUvzAp3NB5HSPcsMy04wz2SUztu8gS1HTWmvQm8Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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