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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8036fef50d996b3547ea5bd0f2072fd054d9970ed5d49595f818b3495f290977' 
  AND token = '6aReIx+LtYVoh7cnyov9YGjRQQTYg7x50vynpL+N3Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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