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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e884d4da80ff3bf88843a13d6abdb30a5b4b3f5f2fa40709ec5706c49f01add' 
  AND token = 'KEkD36hcBjaqlhyXyjoawfGv076ePWTvpb+bl585XGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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