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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c798bc92c8c58f80b22198a77547c9f1f5678debf3ea230f865cc368ffe5240' 
  AND token = 'hw1G4glm/28/HjTBUkikGRjaSoFQ41p4fnics8ImNMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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