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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37babff04134a60142d59db9e9c054f20d994f2de6155e2e269393bb72180728' 
  AND token = 'nT4R8ldD1LczLfu5axoyq/oNHoEw/jX3dK7GRZl50BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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