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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cfd31f9ec0397fe7e0add68f16d8e515b2398e62a5bb828e0730587a8d7b0a' 
  AND token = 'DJVH/IcjLZuXfaV32hDCJ1bVHSz/SObJYCNo9pZLBS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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