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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4378e9297617a69901af7275c32cfd3ffb3cca99e9dd32a7b5c00d6316140f1e' 
  AND token = '0gBMHF9g/ol0Und3nPrDw2enQjCw1HlZrdmMzhyxyQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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