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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfef88b08ce5ebd0253009e55b9b45c7523e6020d914399e2082b2d14d1ca76f' 
  AND token = 'IX0fDID2Tdjb6SS2gZ0rpjOO8YI7hC5Izi9thXZiuM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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