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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b051c9e69a4f78e9caab78722cc5a01d9f3d35a19145ddbb7cd480c364870c0' 
  AND token = 'VpwnpG/L4uX90jY2szMAM83ZRWzkrV63lcqeU3/N0PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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