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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb4d92ba286ffe5858bdac5b863c149c1d5ab0f91e6244fac6220b5bf02f0a2' 
  AND token = 'Wxg9xqtzp5bcz8cOr5WToL7nd/dhSIP7QueKV+qufX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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