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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de889189d459575e1258c3f4354450e95f2eea6fa1567bd4d83ed810e25ad82e' 
  AND token = 'Vfq+31uV44nRw8w4bS6gX9V7mVkQOKmq560NZ6uk42c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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