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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7f029d6d5d20f62b63d7edab53f8af77a131d6c66d1f32e58738d914883719' 
  AND token = 'HsOj0OHxc5NpKt4nAo4pRck5+KQOJlooLGfcVGnrW5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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