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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30afb2a6168bf38669040c4dca3777a2c7cf41700ce75647abaf40764097ce' 
  AND token = 'FwrhajvULR5oDrW3e+Ad81f/cEygToYzwAUTr4OjwqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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