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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec15126650590d4e882618167c937b4b7f2d96694cbbbb32e28f70f0ce3f92a' 
  AND token = 'RL901vIlTdxYLajytinP5hGLxK7tAW25sQUtHT1+DnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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