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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa7ec95c10f6af45b2cff9304e603e26088ba39939360f57464717adc79b038' 
  AND token = 'CRhxs825QVbmdBYeL5YLqskwI+N85se4hPsSKIxoB9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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