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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689cb9b4f7e94ad43882ea005834d47cda271a62b532195df1039c0e2edfc7fc' 
  AND token = 'b2MPTfzUj1voCDPVpGPQn1MAVBpfiRIotI7Uam6V3ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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