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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6d2b1f6c63afe735868b1f43396a4645eb78fd759832d97f3c49e55dad8ba9' 
  AND token = 'x9Sen90ekgEq2ZImXnUIiVNtzqwEm+kj2hN5Ef0X+qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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