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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37231643506cca5ea3de474bc10a2ca9d309c54d762e51696fd9c5f99cb80055' 
  AND token = 'lhS4m/+WouYhHOu/OmaSTKn8ltB/noXy1mLGQ/+oA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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