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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd184a51ce618b38370c1bd2396e0d82273f289e662290286969bcfb3c9ee6fc' 
  AND token = '6a60M7cbSLGEn/2mnv4RJtbIxspf6VRJRQ+Oc8fTVPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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