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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e17f911fd78e7c436ff9f1bdff94433d01e47872eac2d99ce43ffb94e4a5236' 
  AND token = 'Te5YrkB4/r1pmQT6abJa62GShkkqArTdGT9sBpU1LLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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