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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27e9f74c46f1d87d2f2704210737919202139bddc4d2e3298aba465847af9af' 
  AND token = 'oaSRz8wI7L1z10iN133mqop7rQ69Q8XlQ+333CCYGoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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