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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc34aa229bb73ae2933e032eaef001d69d98fd42115f21773b6768077e33aec8' 
  AND token = 'bWHRoRr1SCY1R0Pw/c9YHUjbLx8pJXlQSVckL5kF8Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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