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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c9c0e7ace719c7c293582c794c9958e0ca3d29f40b4af73109729a24d6e609' 
  AND token = '1SudcYWrA029SzBLvbZ0qeHABFo12qWy59RSz1P+u4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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