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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e6e65c7a360669394850092ac30fc440016d3218244a8a2886c75371b4ae89' 
  AND token = '6fW4y4s0oTAXXPNhGF3xI9VWslu0kDxpShKGZic5u1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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