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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec8b921d8eeac195127b41b30eb9739d761e3c9b7d73154ebef2961ae60ee89' 
  AND token = 'PwelLrDVJAoF8O3Meyj2nmxzOtAFSGyqoB7SRbsIyOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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