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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3082fc9f9c5eb811d834c7b09797875098444c90496f8f0dccfe927c2c28e0cf' 
  AND token = 'BTzr9JtQv3aF2vf+SQSambTizKZpT7xFWhNLZ8RRtsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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