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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dceea489e1298b49d274459485b9123ef5991501ce5a97291dee6db6a92b0b3' 
  AND token = 'g0UpMakdAo3JoD3zgjM6xsbu2YDrQcPt+/s6HUB8Qhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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