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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be7223cd0241db46d595a2cab1eb61f5c99210c41a9dfba9c188918416075af' 
  AND token = 'X3VuIurOWy4WBhKl99skGQFNTIU0qTniJKNC8rnkACs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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