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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8e535a27445b690885b28a6fb06a4cca68dbad09dbc0f0c61892467ea41962' 
  AND token = 'cgpK9wVVAPSAWNo4Xt7dHaBRmAIAD5P1Wr0Zs0zR4ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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