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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd228234baa929b8ad6fc1f3780d52a292b996f8693cdae6397184edd8ab73eb' 
  AND token = 'Aa8nhIgc7B0IoJ4MvbRP5d+fMYXqozLQ8xR7y09qDA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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