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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d82633d67b320be700390a9aea603744dd4e073d21df320972d6a5a563efd3' 
  AND token = 'M4siCwLCstWfe7PwDmsOZu6PrOtq71YBzdo/DOsP1Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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