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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5f7b43320283e2dba91c5c5bbaac2ee9199a74a97ddbe9d02bfe53ee60306c' 
  AND token = '+qL3ZNYRs6oYnwngFe+opKpKb6BaxNd3gBDy4VvlUJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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