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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a7355370c2cd513a748d3632ad30929691426a235e84458cf2a671c042b889' 
  AND token = '6qdrmhRcDyoYj77I0V9Ahkk3rQwpgm7ejk3A0J8Y2Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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