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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c2403142fe9fb191df506b4184294dc919099e0b92f2b1de8cbc36fc376cd9' 
  AND token = '7Gfk9G/KW1jufbgEiGy+ggOx156Yx0MONQ3vZWUc+Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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