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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f31ee7f29998db8cae6c2ee055ed9c9ba7c5c40654425ccded3a5566c310503' 
  AND token = 'Fem75cr2QExYqEFv5QPOi+KNoB19WvJNLAqOXi2hdxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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