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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3883831fa43aa78f7b322f1fbeba60ec7d228fac1e8fe7b1ded85c57a3e4889' 
  AND token = 'VHJdsTherxwXnmXl0xtu2RHZlQaHXiqGt64QYlbPOpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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